4000C2=\frac{4000!}{\left(4000-2\right)!\times2!} 7998000 number of ways
Frequently asked questions (FAQs)
Question: Simplify the expression (16/5) - (7/3) + (9/10), and write the result as a mixed number. How many factors does the resulting mixed number have?
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Math question: Can there be three positive integers a, b, and c satisfying the equation a^n + b^n = c^n for n > 2? (
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What is the coordinate of the vertex of the quadratic function f(x) = x^2?